/Engine/Source/Editor/LevelEditor/Public/LevelEditor.h
FLevelEditorOutlinerBuiltInCategories
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FFilterCategory](API\Developer\ToolWidgets\Filters\FFilterCategory) > GetOutlinerFilterCategory ( const [FName](API\Runtime\Core\UObject\FName) & CategoryName ) const